Shear alignment of sphere-morphology block copolymer thin films with viscous fluid flow

Mingshaw W. Wu, Richard A. Register, Paul M. Chaikin

    Research output: Contribution to journalArticle

    Abstract

    The effect of shear on crystalline order is interesting fundamentally, as well as technologically, for producing long-range alignment of micron- and nanoscale structures. We study the influence of shear on a sphere-forming diblock copolymer thin film consisting of a stack of two to six hexagonal layers, using a stress-controlled rheometer to transmit the stress through a viscous fluid layer. Above a threshold stress, the hexagonal layers align macroscopically in the “easy shearâ direction. A simple phenomenological model with an orientation-dependent order-disorder temperature, TODT* = TODT [1a (I• Ic) sin2 (3II)] and recrystallization describes the influence of stress level, temperature, and shearing time remarkably well.

    Original languageEnglish (US)
    Article number040801
    JournalPhysical Review E
    Volume74
    Issue number4
    DOIs
    StatePublished - 2006

    Fingerprint

    Block Copolymers
    viscous fluids
    Viscous Flow
    block copolymers
    Viscous Fluid
    fluid flow
    Fluid Flow
    Thin Films
    Alignment
    alignment
    shear
    thin films
    Hexagon
    Recrystallization
    rheometers
    Copolymer
    shearing
    Disorder
    copolymers
    disorders

    ASJC Scopus subject areas

    • Physics and Astronomy(all)
    • Condensed Matter Physics
    • Statistical and Nonlinear Physics
    • Mathematical Physics

    Cite this

    Shear alignment of sphere-morphology block copolymer thin films with viscous fluid flow. / Wu, Mingshaw W.; Register, Richard A.; Chaikin, Paul M.

    In: Physical Review E, Vol. 74, No. 4, 040801, 2006.

    Research output: Contribution to journalArticle

    Wu, Mingshaw W. ; Register, Richard A. ; Chaikin, Paul M. / Shear alignment of sphere-morphology block copolymer thin films with viscous fluid flow. In: Physical Review E. 2006 ; Vol. 74, No. 4.
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